This episode certainly intended to establish Amon as a morally ambiguous character.
Contrast this with the fire nation and its atavistic 'we'll conquer all' mentality.

If the next episodes don't transform him into yet another moustache twisting villain, this series might actually try something rarely encountered in cartoons - moral ambiguity as opposed to black vs white confrontations.

Aang isn't really Amon. He is guiding her through the place by appearing in his form

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So there was more leaked than just the image? What is your source for that? Also if it was, why do the subtitles say "I am your father?" This would imply that Tenzin is able to enter the spirit world as well.

Azula was a sociopath, to be sure, but she was given nuance and dimension, and a backstory that helped explain why she went so wrong. And when she was finally defeated and broken in the finale, it evoked more pity for her than triumph, in spite of everything.

I think that the whole episode for Korra dealt with her unlocking the first Chakra, Survival by admitting her fear of Amon. I think this because of the flashbacks she saw of Aang and the Gaang fighting Yukon in Republic City after Amon knocked her out. She started to connect with her spiritual side.
In fact I'd go as far to say that Amon deliberately set up the situation on Avatar Aang Memorial Island to unlock her chakra.